1660216320 has 264 divisors, whose sum is σ = 6575684544. Its totient is φ = 379404288.

The previous prime is 1660216267. The next prime is 1660216339. The reversal of 1660216320 is 236120661.

1660216320 is a `hidden beast` number, since 1 + 6 + 6 + 0 + 21 + 632 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 319987 + ... + 325133.

It is an arithmetic number, because the mean of its divisors is an integer number (24907896).

Almost surely, 2^1660216320 is an apocalyptic number.

1660216320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1660216320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3287842272).

1660216320 is an abundant number, since it is smaller than the sum of its proper divisors (4915468224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1660216320 is a wasteful number, since it uses less digits than its factorization.

1660216320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5185 (or 5164 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 1660216320 is about 40745.7521712387. The cubic root of 1660216320 is about 1184.0995776976.

Adding to 1660216320 its reverse (236120661), we get a palindrome (1896336981).

The spelling of 1660216320 in words is "one billion, six hundred sixty million, two hundred sixteen thousand, three hundred twenty".